Improvement in deop-hammees



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WILLIAM H. WATERS, or SPRINGFIELD, MASSACHUSETTS.

7 Letters Patent .No. 69,518, dated October 1, i867.

IMPROVEMENT IN DROP-HAMMERS.

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To ALL WHOM 1r MAY concnmv;

Beit known that I, WILLIAM H. WATERS, of Springfield, in the county of Hampden, in the State of Massachusetts, have invented a new and improved Drop-Hammer; and I do hereby declare that the followingis a full andexact description thereof, reference being had to the accompanying drawings, and to the letters of reference marked thereon.

Figure 1 shows the detached parts of my eccentric clamp employed with the hammer.

Figure '2 is a section of the same parts, in place for use.

Figure 3 isa plan of the eccentric clamp and actuating arm; and

Figure 4 is a side view of said actuating arm and its spring.

Figure 5 is a front elevation, and

Figure 6 is a side'elevation of the-drop-hammer complete.

Similar marks of reference deno'tetlie same parts.

Here'tofore drops have been made, in which the hammer has been drawn up by a board or strap between wo rollers, but in consequence of the rollers being geared together the teeth are frequently broken by the concussion of the falling drop. I obviate this by having the rollers driven in opposite directions by separate pulleys and belts. Again, in drops heretofore made, the rod that causes the rollers to gripe the board or belt has been lifted by the movement of the hammer, and only relieved said rollers when lifted to a positive point or support, hence the hammer required frequent adjustment, or else the parts would vibrate, and neither be fully Iifted or relieved from the gripe on the board. My device obviates this difiiculty by a clamp that sustains the rod at any point to which it may be lifted, so that the hammer is ready to fall as soon as its lifting-rollers have been relieved suflioiently of their gripe on the board or belt by the upwardmo'vemcnt of the hammer.

In this machine the drop-weight or hammer A is raised between two guide-posts B B, by means of a board, C, fastened to the drop-weight A, by a leather strap, D, and made to pass between the faces of two plain rolls F F.- The rolls are brought to bear upon-the board C, which is fastened to the dropammer A, and cause the hammer to rise by two cam-boxes 2, moving around the outside of the shaft 3, connected by two arms 4 4, tothe drop-rod 5. When the foot is placed upon the trcadlc G, the hammer A drops, the dog 6, on the hammer, passes over the arm 7, opens the cam T, and allows the rod 5, connected to cam-boxes 2, to drop, which motion throws the rolls together, and the hammer A ascends until the dog 8 on the hammer strikes the dog 9, on the drop-rod 5, lifts the same, and causes the rolls F F to open the hammer A, then rests on the dog J, until the foot is again applied to the treadle G. The power is applied to the rolls by means of two belts, running upon two pulleys H H, one-upon opposite ends of each shaft, causing the rolls to run in opposite directions, without being connected by gear, as in the old arrangement on drops. A sectional drawing of the rod-holder is given in figs. 1, 2, 3, and 4. The shoe Sis broughtto bear against the drop-rod 5, by the motion of the camshaft 'l operated by dog 6 on the hammer A, striking the arm 7 on cam-Shaft '1, which opens the cam and allows the rod 5 to drop. The rod 5 is held in any position by the pressure of the Spring W against the arm 7. I

I am aware that there are other friction-drops and having used them 1 have seen the need of an improve ment. The friction-rolls are connected by gear, the teeth of which frequently break, and gears have a tendency to crowd the rolls spurt when they begin to lift the hammer. The rolls are thrown together by a cam-shaft connected by an arm! to the drop-rod. When the hammer drops, the dog on the hammer strikes the dog on the drop-rod a tremendous blow, and knocks it elf the stud upon which it (the rod) rests, and on account of the force and suddenness of the blow, hammer is liable frequently to get out of repair. By my arrangement the hammer A passes smoothly over the arm 7, which opens the cam that holds the drop-rod, and the rod drops without a jar. By the old Way the weight of the rod throws the rolls together, and causes the hammer to rise until the dog on the hammer strikes the upper dog on the drop-rod, and opens the rolls. It does not always strike the upper dog hard enough to lift the rod up on to the stud at the bottom of the rod. The consequence is that when the foot-is applied to the treadle the hammer will not come down until the rod is lifted up.

' By my arrangement the drop-rod is held wherever the hammer lifts it, and it remains there until the hammer passes over the arm which opens the cam; the rod then drops. My improvement dispenses with the gear on some 2 the rolls, the cam-shaft. lower dog on droprod, rye-bolt, and spiral spring which guides the lower end of drop rod, stud upon which the rod rests, and the one and three-quarter inch bar which holds up the hammer.

It will be evident that if a lever is applied to move the rod 5 by hand. the hammer can he lowered grad ually, or the hammer may be raised but little to strike a light blow, by the use of such lever, because the clamp S only applies sufficient friction to hold up th weight of the rod 5. and not to prevent its hcing moved easily by a lever or other convenient mechanism, so that the workman has complete control of the hammer.

I am aware that power has been applied to lift the drop by a hell; to a pulley and roller, there being a loose roller on the other side of the board or strap. In this case, however, the lifting power was applied to one surface only, and had also to overcome the friction of turning the other roller. In my drop the power being applied by both rollers, there is less wear upon the surface of the hoard or strap, the pressure to kee the rollers to said board or strap is much less, and the hammer or drop is much more perfectly under control either in being raised or lowered.

What I claim, and desire to secure by Letters Patent. is-

1. A pair of rollers, F F, each of which is separately rotated h v power applied to the pulleys ll ll, in combination with the board or strap and drop, substantially as set forth, so that lifting power is applied to each surface of the strap or belt in the manner and for the purposes set forth.

2. In combination with the rod 5 and drop, I claim the mechanism substantially as set forth, for sustaining the rod at any point to which it may he raised. as specified.

WM. II. WATERS.

Witnesses:

Cass. A. EMl-JRY, WM. H. HALEY. 

